I'm loving this. I think the curly hair, whether it's in the books or not, suits Blend very well.
Also, have some thoughts on the matter that may or may not be too late.. I think they are both a bit older, as already in GotM both are veterans and iirc, Paran thinks of Picker as old. Also, I think that both are from Qoun Tali, mainly because they joined the Bridgeburners before the campaign on Genabackis started, and I'm sure we'd have gotten a mention about it if they were from Seven Cities. Still, Quon Tali seems quite diverse anyway, so that shouldn't be of much importance. Just a thought.
Another thing is that often-cited TtH mention of Picker being old and heavy, BUT it equally often gets overlooked that this description comes from an assassin who's hyping himself up to kill her, and it's later revealed that she's wearing the heavy cloak to hide the weapons beneath it, fully aware of what it makes her look like. That said, I think you got her physique perfectly, just needs a lot more scars.
Also, personally, I've always though of Picker as short-haired and with, I dunno, brownish hair, however, I have no idea why. I like your version anyway